Compilare: main.cpp: In function 'int main()': main.cpp:10:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xortransform.in", "r", stdin); ^ main.cpp:11:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xortransform.out", "w", stdout); ^ main.cpp:12:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int n, m, q, ans = 0; scanf("%d %d %d", &n, &m, &q); ^ main.cpp:15:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int x; scanf("%d", &x);; dp[i | j] ^= x; } } ^ main.cpp:22:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int k; scanf("%d", &k); ^